.tox/py3/lib/python3.7/site-packages/swh/model/tests/test_generate_testdata.py:8: in <module> from swh.model.model import Origin, BaseContent .tox/py3/lib/python3.7/site-packages/swh/model/model.py:13: in <module> from attrs_strict import type_validator E ModuleNotFoundError: No module named 'attrs_strict'